KR102124901B1 - Wireless power receiving apparatus and wireless power transmitting system comprising the same - Google Patents

Abstract

A wireless power receiving device for wirelessly charging power according to an embodiment of the present invention is a soft magnetic layer formed on a substrate, on the substrate, and having a plurality of patterns including three or more lines emitted from a predetermined point, And it is laminated on the soft magnetic layer, and includes a coil that receives electromagnetic energy radiated from the wireless power transmission device.

Description

A wireless power receiving device and a wireless power transmission system including the same {WIRELESS POWER RECEIVING APPARATUS AND WIRELESS POWER TRANSMITTING SYSTEM COMPRISING THE SAME}

The present invention relates to wireless charging, and more particularly, to a wireless power receiving apparatus and a wireless power transmission system including the same.

The wireless power transmission/reception technology is a technology that wirelessly supplies power to electronic devices. In order to increase power transmission/reception efficiency, it is necessary to minimize energy loss between the wireless power transmission device and the wireless power reception device. To this end, a soft magnetic material may be disposed around the transmitting antenna and the receiving antenna to focus electromagnetic energy emitted by the transmitting antenna in the direction of the receiving antenna. When the soft magnetic layer is a sheet containing a ferrite material, the magnetic permeability is good, but there are limitations in thickness due to high temperature firing and magnetic flux density limitations. In addition, when the soft magnetic layer is a composite sheet including a metal powder and a polymer resin, there is a problem that the permeability is lowered.

On the other hand, when the soft magnetic layer is a metal ribbon, high permeability and magnetic flux density can be obtained with a thin thickness. Therefore, there is a need for a technique for applying a metallic ribbon to a soft magnetic layer.

The technical problem to be achieved by the present invention is to provide a wireless power receiving apparatus and a wireless power transmission system including the same.

A magnetic sheet according to an embodiment of the present invention includes a substrate; And a soft magnetic layer disposed on the substrate and having a crack pattern formed thereon, wherein the crack pattern comprises: a first pattern; And a plurality of second patterns disposed adjacent to the first pattern, wherein the first pattern and the plurality of second patterns each include a predetermined center point; An edge portion spaced apart from the predetermined center point and surrounding at least a portion of the predetermined center point; And a plurality of radiations emitted from the predetermined center point. The center points of the first pattern and the center points of the plurality of second patterns are spaced apart from each other according to a predetermined rule, and a part of the edge portion of the first pattern is cut off. Includes intervals.
The number of the plurality of radiation may be six or more.
The plurality of radiations may be disposed between the predetermined center point and the edge portion.
The number of the plurality of second patterns may be 3 to 8.
The border portion of the first pattern may include a plurality of border lines.
The disconnection section may be a section in which any one of the plurality of border lines and one of the border lines and neighboring border lines are not connected to each other.
The first pattern may include a first region formed between a first radiation among the plurality of radiations and a second radiation adjacent to the first radiation; A second region formed between the second radiation and the second radiation and a neighboring third radiation; A third region formed between the third radiation and the fourth radiation and a neighboring fourth radiation; A fourth region formed between the fourth radiation and the fifth radiation adjacent to the fourth radiation; And a fifth region formed between the fifth radiation and the fifth radiation and a neighboring sixth radiation, wherein the plurality of border lines includes: a first border line surrounding at least a portion of the first area; A second border line surrounding at least a portion of the second region; A third border line surrounding at least a portion of the third area; A fourth border line surrounding at least a portion of the fourth area; And a fifth border line surrounding at least a portion of the fifth area, wherein at least one of the first to fifth border lines is connected to another neighboring border line.
A plurality of radiations emitted from the center point of the first pattern may be further included between the fifth region and the first region.
The distance between two predetermined points facing each other of the edge portion in contact with the virtual straight line passing through the center point of the first pattern may be 50 μm to 600 μm.
The soft magnetic layer may have a thickness of 0.01 mm to 0.04 mm.
A region spaced from each other may be included between the edge portion of the first pattern and the edge portion of the plurality of second patterns.
Some of the at least one rim of the plurality of second patterns may include at least one cutoff section.
At least one of the border portion of the first pattern and the border portions of the plurality of second patterns may include a circular shape.
At least one of the edge portions of the first pattern and the edge portions of the plurality of second patterns may include a curvature.
A magnetic sheet according to another embodiment of the present invention includes a substrate; And a soft magnetic layer disposed on the substrate and having a crack pattern formed thereon, wherein the crack pattern comprises: a first pattern; And a plurality of neighboring patterns arranged adjacent to the first pattern, wherein each of the first pattern and the plurality of neighboring patterns includes a predetermined center point; An edge portion spaced apart from the predetermined center point and surrounding at least a portion of the predetermined center point; And a plurality of radiations radiated from the predetermined center point, wherein the plurality of neighboring patterns includes: a second pattern and a third pattern arranged in a first direction around the first pattern; A fourth pattern and a fifth pattern disposed along a second direction intersecting the first direction with respect to the first pattern; And a sixth pattern and a seventh pattern formed between the first direction and the second direction with respect to the first pattern, and disposed along a third direction intersecting the first direction and the second direction. Including, the distance between the center point of the first pattern and the center point of the second pattern and the distance between the center point of the first pattern and the center point of the fourth pattern, each of the center point of the first pattern and the sixth pattern Less than the distance between the center points of, the distance between the first pattern and the second pattern and the distance between the first pattern and the fourth pattern, each contacting an imaginary straight line passing through the center point of the first pattern The distance of the first pattern is smaller than a distance between two predetermined points facing each other, and a part of the border of the first pattern includes a cutoff section.
At least one of each edge portion of the first to seventh patterns may include a circular shape.
The distance between two predetermined points facing each other of the edge portion of the first pattern in contact with an imaginary straight line passing through the center point of the first pattern may be 50 μm to 600 μm.
At least one of the plurality of radiations of the first pattern may not be connected to an edge portion of the first pattern.
The number of the plurality of radiations of the first pattern may be six or more.
A wireless power receiving apparatus according to an embodiment of the present invention includes a substrate; A soft magnetic layer disposed on the substrate and forming a crack pattern; And a coil portion disposed on the soft magnetic layer, wherein the crack pattern of the soft magnetic layer includes: a first pattern; And a plurality of neighboring patterns arranged adjacent to the first pattern, wherein each of the first pattern and the plurality of neighboring patterns includes a predetermined center point; An edge portion spaced apart from the predetermined center point and surrounding at least a portion of the predetermined center point; And a plurality of radiations radiated from the predetermined center point, wherein the plurality of neighboring patterns includes: a second pattern and a third pattern arranged in a first direction around the first pattern; A fourth pattern and a fifth pattern disposed along a second direction intersecting the first direction with respect to the first pattern; And a sixth pattern and a seventh pattern formed between the first direction and the second direction with respect to the first pattern, and disposed along a third direction intersecting the first direction and the second direction. Including, the distance between the center point of the first pattern and the center point of the second pattern and the distance between the center point of the first pattern and the center point of the fourth pattern, each of the center point of the first pattern and the sixth pattern Less than the distance between the center points of, the distance between the first pattern and the second pattern and the distance between the first pattern and the fourth pattern, each contacting an imaginary straight line passing through the center point of the first pattern The distance of the first pattern is smaller than a distance between two predetermined points facing each other, and a part of the border of the first pattern includes a cutoff section.

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According to the embodiment of the present invention, a metal ribbon having a high real permeability within a frequency range used for wireless charging can be obtained. Accordingly, it is possible to obtain a wireless power transmission system that is slim and has high power transmission efficiency.

1 is a magnetic induction type equivalent circuit.
2 is a block diagram showing a transmitter as one of sub-systems constituting a wireless power transmission system.
3 is a block diagram showing a receiver as one of the sub-systems constituting the wireless power transmission system.
4 is a view showing a part of a wireless power transmission apparatus according to an embodiment of the present invention.
5 is a diagram illustrating a part of a wireless power receiving apparatus according to an embodiment of the present invention.
6 is a graph comparing the actual permeability for each frequency before and after forming a crack in the metal ribbon.
7 to 9 show a top view of a soft magnetic layer according to an embodiment of the present invention.
10 to 11 are top views of a soft magnetic layer according to another embodiment of the present invention.
12 is a top view of a soft magnetic layer according to another embodiment of the present invention.
13 shows the metal ribbon used in Comparative Example 1.
14 shows the metal ribbon used in Example 1.
15 shows the metal ribbon used in Example 2.
16 shows the metal ribbon used in Example 3.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as second and first may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, the second component may be referred to as a first component without departing from the scope of the present invention, and similarly, the first component may also be referred to as a second component. The term and/or includes a combination of a plurality of related described items or any one of a plurality of related described items.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “include” or “have” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms, such as those defined in a commonly used dictionary, should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings, but the same or corresponding components are assigned the same reference numbers regardless of reference numerals, and redundant descriptions thereof will be omitted.

Hereinafter, with reference to the drawings of a wireless power transmission system according to an embodiment of the present invention will be described in detail. The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Throughout the specification, the same reference numbers indicate the same components.

In the embodiment, various types of frequency bands from low frequency (50 kHz) to high frequency (15 MHz) are selectively used for wireless power transmission, and support for a communication system capable of exchanging data and control signals is required for system control. .

The embodiment can be applied to various industries such as the portable terminal industry, smart watch industry, computer and notebook industry, home appliance industry, electric vehicle industry, medical device industry, robot industry, etc. .

The embodiment may consider a system capable of transmitting power to one or more devices using one or more transmission coils provided with the devices.

According to an embodiment, a battery shortage problem in a mobile device such as a smart phone or a laptop can be solved. For example, when a wireless charging pad is placed on a table and a smart phone or a laptop is used thereon, the battery is automatically charged to be used for a long time. . In addition, if wireless charging pads are installed in public places such as cafes, airports, taxis, offices, and restaurants, it is possible to charge various mobile devices regardless of different charging terminals for each mobile device manufacturer. In addition, if the wireless power transmission technology is applied to household appliances such as vacuum cleaners and electric fans, there is no need to search for a power cable, and as complicated wires disappear in the home, wiring in the building can be reduced and space utilization can be widened. In addition, it takes a lot of time to charge an electric vehicle with current household power, but if it transmits high power through wireless power transmission technology, the charging time can be reduced. If a wireless charging facility is installed on the floor of a parking lot, the power cable around the electric vehicle It can solve the inconvenience of having to prepare.

Terms and abbreviations used in the examples are as follows.

Wireless Power Transfer System: A system that provides wireless power transfer within the magnetic field.

Transmitter (Wireless Power Transfer System-Charger): A device that manages the entire system by providing wireless power transfer to the power receivers of multiple devices within the magnetic field.

Wireless Power Transfer System-Deivce: A device that receives wireless power transmission from a power transmitter within a magnetic field.

Charging Area: An area where actual wireless power transmission occurs in the magnetic field area, and may vary depending on the size of the application, the required power, and the operating frequency.

S parameter (Scattering parameter): S parameter is the ratio of the input voltage to the output voltage in the frequency distribution as the ratio of the input port to the output port (Transmission; S21) or the reflection value of each input/output port, that is, by its own input. The value of the reflected output (Reflection; S11, S22).

Quality factor Q (Quality factor): The value of Q in resonance means the quality of frequency selection, and the higher the Q value, the better the resonance characteristic, and the Q value is expressed as the ratio of energy stored in the resonator and energy lost.

Looking at the principle of transmitting power wirelessly, one of the principles of wireless power transmission is a magnetic induction method.

The magnetic induction method is a non-contact energy transmission technology in which electromotive force is generated in the load inductor Ll through the magnetic flux generated when the source inductor Ls and the load inductor Ll are brought close to each other and current flows through one of the source inductors Ls. .

1 is a magnetic induction type equivalent circuit.

Referring to FIG. 1, in a magnetic induction-type equivalent circuit, a transmitter performs magnetic coupling with a source voltage (Vs), a source resistor (Rs), a source capacitor (Cs) for impedance matching, and a receiver according to a device that supplies power. It can be implemented as a source coil (Ls), and the receiver is implemented as a load resistor (Rl), which is the equivalent resistance of the receiver, a load capacitor (Cl) for impedance matching, and a load coil (Ll) for magnetic coupling with the transmitter. The magnetic coupling degree between the source coil Ls and the load coil Ll may be represented by mutual inductance Msl.

In FIG. 1, the ratio of the input voltage to the output voltage (S21) is obtained from the magnetic induction equivalent circuit consisting only of the coil without the source capacitor (Cs) and the load capacitor (Cl) for impedance matching. The power transmission condition satisfies Equation 1 below.

Equation 1

Ls/Rs=Ll/Rl

According to Equation 1, when the ratio of the inductance of the transmission coil Ls and the source resistance Rs is equal to the ratio of the inductance of the load coil Ll and the load resistance Rl, the maximum power transmission is possible. In a system with only inductance, since there is no capacitor capable of compensating for reactance, the self-reflection value (S11) of the input/output port cannot be 0 at the point where the maximum power transfer is achieved, and mutual inductance (Msl) Depending on the value, the power transmission efficiency can be greatly changed. Thus, as a compensation capacitor for impedance matching, a source capacitor Cs may be added to the transmitter and a load capacitor Cl may be added to the receiver. The compensation capacitors Cs and Cl may be connected in series or in parallel to each of the receiving coil Ls and the load coil Ll, for example. In addition, passive elements such as an additional capacitor and an inductor as well as a compensation capacitor may be added to each of the transmitter and the receiver for impedance matching.

Based on the wireless power transmission principle, a wireless power transmission system for transmitting power in a magnetic induction method or a magnetic resonance method will be described.

2 is a block diagram showing a transmitter as one of sub-systems constituting a wireless power transmission system.

Referring to FIG. 2, the wireless power transmission system may include a transmitter 1000 and a receiver 2000 wirelessly receiving power from the transmitter 1000, and the transmitter 1000 is AC/DC conversion on the transmission side. It may include a unit 1100, a transmission-side DC/AC conversion unit 1200, a transmission-side impedance matching unit 1300, a transmission coil unit 1400, and a transmission-side communication and control unit 1500. In this specification, the transmitter 1000 may be mixed with a wireless power transmitter.

The transmission-side AC/DC conversion unit 1100 is a power conversion unit that converts an AC signal provided from the outside into a DC signal under the control of the transmission-side communication and control unit 1500, and the transmission-side AC/DC conversion unit 1100 The sub-system may include a rectifier 1110 and a transmitting DC/DC converter 1120. The rectifier 1110 is a system for converting the provided AC signal into a DC signal. As an example of implementing this, a diode rectifier having a relatively high efficiency during high frequency operation, a synchronous rectifier capable of one-chipization, or cost And a hybrid rectifier capable of saving space and having a high degree of freedom in dead time. In addition, the transmission-side DC/DC conversion unit 1120 adjusts the level of the DC signal provided from the rectifier 1110 under the control of the transmission-side communication and control unit 1500 to reduce the level of the input signal as an example of implementing this. It can be a buck converter, a boost converter that increases the level of the input signal, a buck boost converter or a uk converter that can lower or increase the level of the input signal. In addition, the transmitting DC/DC converter 1120 includes a switch element that functions as a power conversion control function, an inductor and a capacitor that functions as a power conversion medium or an output voltage smoothing function, and adjusts voltage gain or electrically separates the function (insulation function). It may include a transformer and the like, and may function to remove ripple components or pulsating components (AC components included in the DC signal) included in the input DC signal. And the error between the command value of the output signal of the transmitting DC/DC converter 1120 and the actual output value can be adjusted through a feedback method, which can be achieved by the transmitting communication and control unit 1500. .

The transmitting DC/AC converter 1200 converts the DC signal output from the transmitting AC/DC converter 1100 into an AC signal under the control of the transmitting communication and control unit 1500, and the frequency of the converted AC signal. Examples of realizing this as a system that can control a half bridge inverter (Half bridge inverter) or a full bridge inverter (Full bridge inverter). In addition, the transmitting-side DC/AC converter 1200 may include an oscillator for generating the frequency of the output signal and a power amplifier for amplifying the output signal.

The transmission-side impedance matching unit 1300 improves signal flow by minimizing reflected waves at points having different impedances. Since the two coils of the transmitter 1000 and the receiver 2000 are spatially separated, there is a lot of magnetic field leakage, so the impedance difference between the two connection terminals of the transmitter 1000 and the receiver 2000 is corrected to improve power transmission efficiency. I can do it. The transmission-side impedance matching unit 1300 may be composed of an inductor, a capacitor, and a resistance element. Under the control of the communication and control unit 1500, impedance matching is performed by varying the resistance values of the inductance of the inductor, the capacitance of the capacitor, and the resistance. The impedance value can be adjusted. In addition, when the wireless power transmission system of the magnetic induction method transmits power, the impedance matching unit 1300 on the transmission side may have a series resonance structure or a parallel resonance structure, and inductive coupling between the transmitter 1000 and the receiver 2000 The energy loss can be minimized by increasing the coefficient.

The transmitting side coil 1400 may be implemented as a plurality of coils or a single number of coils, and when the transmitting side coil 1400 is provided in a plurality, they may be disposed spaced apart from each other or overlapped with each other, and they are disposed to overlap. If possible, the overlapping area can be determined by considering variations in magnetic flux density. In addition, when manufacturing the coil 1400 on the transmission side, it may be manufactured in consideration of internal resistance and radiation resistance. In this case, when the resistance component is small, a quality factor may increase and a transmission efficiency may increase.

The communication and control unit 1500 may include a transmission-side control unit 1510 and a transmission-side communication unit 1520 as subsystems. The transmitting-side control unit 1510 may serve to adjust the output voltage of the transmitting-side AC/DC converter 1100 in consideration of the power demand of the receiving unit 2000, the current charging amount, and the wireless power method. And considering the maximum power transmission efficiency, it is possible to control the power to be transmitted by generating frequency and switching waveforms for driving the DC/AC converter 1200 on the transmission side. In addition, the overall operation of the receiver 2000 may be controlled by using an algorithm, program, or application required for control read from a storage unit (not shown) of the receiver 2000. Meanwhile, the control unit 1510 on the transmission side may be referred to as a microprocessor, a microcontroller unit, or a micom. The transmitting-side communication unit 1520 may perform communication with the receiving-side communication unit 2620, and may use a Bluetooth method as an example of the communication method. The transmitting-side communication unit 1520 and the receiving-side communication unit 2620 may communicate with each other, such as charging status information and charging control commands. In addition, the charging status information may include the number of receiving units 2000, the remaining battery capacity, the number of charges, the amount of usage, the battery capacity, the battery ratio, and the amount of transmission power of the transmitting unit 1000. In addition, the transmitting-side communication unit 1520 may transmit a charging function control signal to control the charging function of the receiving unit 2000, and the charging function control signal controls the receiving unit 2000 to enable the charging function or It may be a control signal to disable (disabled).

Meanwhile, the transmitter 1000 is configured with different hardware from the transmitter-side communication unit 1520 so that the transmitter 1000 may be communicated in an out-band format. In addition, the transmitter 1000 and the transmitter-side communication unit 1520 may be implemented with one hardware, so that the transmitter 1000 may perform communication in an in-band format. Also, the transmitting-side communication unit 1520 may be configured separately from the transmitting-side control unit 1510, and the receiving unit 2000 and the receiving-side communication unit 2620 may be included in the control unit 2610 of the receiving device or separately configured. Can be.

3 is a block diagram showing a receiver as one of the sub-systems constituting the wireless power transmission system.

Referring to FIG. 3, the wireless power transmission system may include a transmitter 1000 and a receiver 2000 wirelessly receiving power from the transmitter 1000, and the receiver 2000 includes a receiver side coil unit 2100. ), the receiving-side matching unit 2200, the receiving-side AC/DC converter 2300, the receiving-side DC/DC converter 2400, the load unit 2500 and the receiving-side communication and control unit 2600. have. In the present specification, the receiver 2000 may be mixed with a wireless power receiver.

The receiving side coil unit 2100 may receive power through a magnetic induction method, and may include one or a plurality of induction coils. In addition, the receiving side coil unit 2100 may be provided with a near field communication antenna. In addition, the receiving side coil part 2100 may be the same as the transmitting side coil part 1400, and the dimensions of the receiving antenna may vary according to the electrical characteristics of the receiving part 200.

The receiver matching unit 2200 performs impedance matching between the transmitter 1000 and the receiver 2000.

The receiving AC/DC converter 2300 rectifies the AC signal output from the receiving coil part 2100 to generate a DC signal.

The receiving DC/DC converter 2400 may adjust the level of the DC signal output from the receiving AC/DC converter 2300 according to the capacity of the load 2500.

The load unit 2500 may include a battery, a display, an audio output circuit, a main processor, and various sensors.

The receiving-side communication and control unit 2600 may be activated by wake-up power from the transmitting-side communication and control unit 1500, perform communication with the transmitting-side communication and control unit 1500, and serve as a sub of the receiving unit 2000. You can control the operation of the system.

The receiving unit 2000 may be composed of a single number or a plurality of units, and simultaneously receive energy wirelessly from the transmitting unit 1000. That is, in the magnetic induction method, a plurality of target-side receiving units 2000 may be supplied with power from one transmitting unit 1000 by providing a plurality of receiving-side coil units that are independent of each other. In this case, the transmission side matching unit 1300 of the transmission unit 1000 may adaptively perform impedance matching between the plurality of reception units 2000.

In addition, when the receiver 2000 is composed of a plurality, the same type of system or different types of system may be used.

On the other hand, looking at the relationship between the size and frequency of the signal of the wireless power transmission system, in the case of the wireless power transmission of the magnetic induction method, the transmitting side AC/DC converter 1100 in the transmitter 1000 transmits an AC signal of 60 Hz from 110V to 220V. It can be converted into a DC signal from 10V to 20V and output, and the DC/AC converter 1200 on the transmission side receives the DC signal and outputs an AC signal of 125KHz. In addition, the receiving-side AC/DC converter 2300 of the receiving unit 2000 may receive an AC signal of 125KHz and convert it into a DC signal of 10V to 20V, and output the converted DC/DC converter 2400. Suitable for the secondary 2500, for example, outputting a DC signal of 5V can be transmitted to the load unit 2500.

4 is a view showing a part of a wireless power transmission apparatus according to an embodiment of the present invention, and FIG. 5 is a view showing a part of a wireless power reception apparatus according to an embodiment of the present invention. Here, the wireless power transmitter may be a part of the transmitter 1000 of FIG. 2, and the wireless power receiver may be a part of the receiver 2000 of FIG. 3.

Referring to FIG. 4, the wireless power transmission apparatus 100 includes a transmission circuit (not shown), a soft magnetic core 110, a transmission coil 120, and a permanent magnet 130.

The soft magnetic core 110 may be made of a soft magnetic material having a thickness of several mm. In addition, the permanent magnet 130 may be surrounded by the transmission coil 120. Here, the permanent magnet 130 is not an essential configuration and may be omitted according to specifications.

Referring to FIG. 5, the wireless power receiving apparatus 200 includes a receiving circuit (not shown), a soft magnetic layer 210, and a receiving coil 220. The soft magnetic layer 210 may be stacked on a substrate (not shown). The substrate may be formed of several layers of fixed sheets, and bonded to the soft magnetic layer 210 to fix the soft magnetic layer 210.

The soft magnetic layer 210 focuses electromagnetic energy radiated from the transmission coil 120 of the wireless power transmission apparatus 100.

The receiving coil 220 is stacked on the soft magnetic layer 210. The receiving coil 220 may be wound on the soft magnetic layer 210 in a direction parallel to the soft magnetic layer 210. For example, a receiving antenna applied to a smartphone may be in the form of a spiral coil within an outer diameter of 50 mm and an inner diameter of 20 mm or more. The receiving circuit converts electromagnetic energy received through the receiving coil 220 into electrical energy, and charges the converted electrical energy into a battery (not shown).

Although not illustrated, a heat dissipation layer may be further included between the soft magnetic layer 210 and the receiving coil 220. In this specification, the substrate, the soft magnetic layer 210 and the receiving coil 220 may be referred to as a receiving antenna.

Meanwhile, when the wireless power receiving apparatus 200 simultaneously has a WPC function and a near field communication (NFC) function, the NFC coil 230 may be further stacked on the soft magnetic layer 210. The NFC coil 230 may be formed to surround the outside of the receiving coil 220.

In addition, each of the receiving coil 220 and the NFC coil 230 may be electrically connected through the terminal 240.

When the soft magnetic layer 210 is a sheet containing ferrite, the magnetic permeability is good, but there are limitations in thickness due to high temperature sintering and limits of magnetic flux density. In addition, when the soft magnetic layer 210 is a composite sheet including a metal powder and a polymer resin, there is a problem that the permeability is lowered due to the polymer resin. On the other hand, when the soft magnetic layer 210 is a metal ribbon, it is possible to obtain a high magnetic permeability and magnetic flux density with a thin thickness. However, the metal ribbon has a large magnetic loss in a frequency domain used for wireless charging.

According to one embodiment of the present invention, a metal ribbon is used as the soft magnetic layer 210, but a crack is formed in the metal ribbon to reduce eddy current loss.

6 is a graph comparing the actual permeability for each frequency before and after forming a crack in the metal ribbon. Here, the difference between the permeability and the loss of permeability may mean the actual permeability.

Referring to FIG. 6, it can be seen that in the frequency domain in which wireless charging is used, for example, in the band of about 150 kHz, the actual permeability after forming a crack in the metal ribbon is significantly greater than the actual permeability before forming the crack.

In the present specification, the metal ribbon refers to an amorphous or nanocrystalline metal or alloy made of a very thin foil through an atomizer or the like technique. The thickness of the metal ribbon may be, for example, 0.01 mm to 0.04 mm. In the present specification, the metal ribbon may be a metal ribbon including iron (Fe).

When the metal ribbon is used as the soft magnetic layer 210 of the wireless power receiving apparatus 200, cracks may be formed in the metal ribbon to reduce eddy current loss and improve transmission efficiency. However, when a non-uniform crack is formed in the metal ribbon, the effect of improving the transmission efficiency may be halved, and there is a problem that a reliable result cannot be obtained because the performance of the soft magnetic layer is non-uniform.

According to one embodiment of the present invention, by forming a crack of a uniform pattern on the metal ribbon to improve the transmission efficiency of the soft magnetic layer, it is intended to uniform the performance.

7 to 9 show a top view of a soft magnetic layer according to an embodiment of the present invention.

Referring to FIGS. 7 to 9, a pattern 700 including three or more lines 720 emitted from a predetermined point 710 is formed on the soft magnetic layer 210. Here, the pattern may be formed of cracks. At this time, a plurality of patterns 700 may be repeatedly formed on the soft magnetic layer 210, and one pattern 700 is arranged to be surrounded by a plurality of patterns, for example, 3 to 8 patterns 700. Can be.

As described above, when a repetitive pattern is formed on the soft magnetic layer 210, eddy current loss is reduced, and uniform and predictable transmission efficiency can be obtained.

At this time, the average diameter of each pattern 700 may be 50 μm to 600 μm. When the diameter of the pattern 700 is less than 50 μm, metal particles may be excessively formed on the surface of the metal ribbon during crack formation. When there are metal particles on the surface of the soft magnetic layer 210, there is a possibility that the metal particles penetrate into the circuit, and there is a risk of circuit short circuit. On the other hand, when the diameter of the pattern 700 exceeds 600 μm, the distance between the patterns 700 is large, so that the effect of crack formation, that is, the effect of increasing the actual permeability may be reduced.

10 to 11 are top views of a soft magnetic layer according to another embodiment of the present invention.

Referring to FIGS. 10 to 11, the soft magnetic layer 210 is formed with a pattern 700 including three or more lines 720 radiating from a predetermined point 710 and a border 730 surrounding it. Here, the pattern may be formed of cracks. Here, the border 730 is not a completely cut crack, and some may be connected and some may mean a broken crack. At this time, a plurality of patterns 700 may be repeatedly formed on the soft magnetic layer 210, and one pattern 700 is arranged to be surrounded by a plurality of patterns, for example, 3 to 8 patterns 700. Can be.

As described above, when a repetitive pattern is formed on the soft magnetic layer 210, eddy current loss is reduced, and uniform and predictable transmission efficiency can be obtained.

At this time, the average diameter of each pattern 700 may be 50 μm to 600 μm. When the diameter of the pattern 700 is less than 50 μm, metal particles may be generated on the surface of the metal ribbon during crack formation. If there are excessive metal particles on the surface of the soft magnetic layer 210, there is a possibility that the metal particles penetrate into the circuit, and there is a risk of circuit short circuit. On the other hand, when the diameter of the pattern 700 exceeds 600 μm, the distance between the patterns 700 is large, so that the effect of crack formation, that is, the effect of increasing the actual permeability may be reduced. When the pattern 700 includes the border 730, the effect of crack formation is further increased, and since the boundary between the patterns 700 is clearly divided, a repetitive pattern pattern becomes clear, and thus uniformity of quality may be further increased.

Preferably, as shown in FIG. 11, the pattern 700 may include six or more lines 720 radiating from a predetermined point 710 and a border 730 surrounding it. When six or more lines 720 radiating in the border 730 are formed, the effect of crack formation may be maximized.

12 is a top view of a soft magnetic layer according to another embodiment of the present invention.

Referring to FIG. 12, the soft magnetic layer 210 is formed with a pattern 700 including three or more lines 720 emitted from a predetermined point 710 and a border 730 surrounding two or more lines. Here, the pattern may be formed of cracks. At this time, a plurality of patterns 700 may be repeatedly formed on the soft magnetic layer 210, and one pattern 700 is arranged to be surrounded by a plurality of patterns, for example, 3 to 8 patterns 700. Can be.

As described above, when a repetitive pattern is formed on the soft magnetic layer 210, eddy current loss is reduced, and uniform and predictable transmission efficiency can be obtained.

At this time, the average diameter of each pattern 700 may be 50 μm to 600 μm. When the diameter of the pattern 700 is less than 50 μm, metal particles may be generated on the surface of the metal ribbon during crack formation. When there are metal particles on the surface of the soft magnetic layer 210, there is a possibility that the metal particles penetrate into the circuit, and there is a risk of circuit short circuit. On the other hand, when the diameter of the pattern 700 exceeds 600 μm, the distance between the patterns 700 is large, so that the effect of crack formation, that is, the effect of increasing the actual permeability may be reduced.

According to an embodiment of the present invention, it can be pressed using a roller made of a urethane material protruding in a pattern shape to form a crack of a uniform pattern on the metal ribbon. The urethane-based roller can form a crack pattern more uniformly than the metal-based roller, and can minimize the phenomenon of metal particles remaining on the surface of the metal ribbon. At this time, the pressurizing process may be performed in 25 to 200° C., 10 to 3000 Pa, for 10 minutes or less.

As such, by using a metal ribbon in which a crack of a repetitive pattern is formed as a soft magnetic layer of a wireless power receiving device, permeability and saturation magnetism can be increased, and eddy current loss can be reduced. In addition, by forming a crack of a uniform pattern on the metal ribbon, it is possible to increase the transmission efficiency and obtain uniform and predictable performance.

Table 1 is a table comparing the performance of transmission efficiency of a wireless power transmission system when a metal ribbon with random cracks is used as a soft magnetic layer and a metal ribbon with cracks repeatedly formed as a soft magnetic layer. Here, the metal ribbon is a nanocrystalline metal ribbon containing Fe. 13 shows a metal ribbon in which a random-shaped crack used in Comparative Example 1 is formed, FIG. 14 shows a metal ribbon in which a cross-shaped crack used in Example 1 is repeatedly formed, and FIG. 15 is used in Example 2 A metal ribbon in which a cross-shaped crack surrounded by an enclosed rim is repeatedly formed, and FIG. 16 is a metal in which a crack in a star shape (8 lines emitted from a predetermined point) surrounded by the rim used in Example 3 is repeatedly formed Represents a ribbon.

No. Pattern shape Transmission efficiency (@3W) Transmission efficiency (@5w) Metal particles Comparative Example 1 Random shape 68% 69.9% O Example 1 Cross shape 68% 70.1% X Example 2 Cross shape surrounded by border 68.2% 69.9% X Example 3 Star shape surrounded by borders 69.9% 71.7% X

Referring to Table 1 and FIGS. 13 to 16, it can be seen that compared to the metal ribbon in which the crack is formed in a random shape, the transmission efficiency of the metal ribbon in which the crack is formed in a regularly repeated pattern is higher. In particular, it can be seen that, as in Example 3, the pattern has the highest transmission efficiency when it includes six or more lines radiating from a predetermined point and a border surrounding it, that is, a star shape surrounded by a border. As shown in Table 1, the crack formation effect of the repeated pattern may be more advantageous at high power. This is because the strength of the magnetic field increases with an increase in the amount of current, and the metal ribbon of the receiving part is also affected by the magnetic field as the magnetic field increases. As described above, referring to a preferred embodiment of the present invention, Those skilled in the art will appreciate that various modifications and changes can be made to the present invention without departing from the spirit and scope of the invention as set forth in the claims below.

1100 Transmission/AC conversion unit
1110 rectifier
1120 Transmitting DC/DC converter
1200 Transmission DC/AC converter
1300 transmitter-side impedance matching unit
1400 transmission coil unit
1500 Transmission-side communication and control
1510 Sending side control
1520 Transmission side communication unit
2000 Receiver
2100 Receiver side coil part
2200 receiver impedance matching unit
2300 Receiver-side AC/DC converter
2400 Receiver DC/DC converter
2500 load
2600 Receiver communication and control
2610 Receiver control
2620 receiving side communication
100 wireless power transmitter
200 wireless power receiver
700 patterns

Claims (21)

Board; And
Includes; disposed on the substrate and a soft magnetic layer formed with a crack pattern,
The crack pattern,
A first pattern; And
Including; a plurality of second patterns disposed adjacent to the first pattern;
Each of the first pattern and the plurality of second patterns,
A predetermined center point;
An edge portion spaced apart from the predetermined center point and surrounding at least a portion of the predetermined center point; And
It includes; a plurality of radiation emitted from the predetermined center point;
The center points of the first pattern and the center points of the plurality of second patterns are separated from each other by a predetermined rule,
A magnetic sheet including a cutout section of a part of the edge portion of the first pattern. According to claim 1,
The number of the plurality of radiation is a magnetic sheet of 6 or more. According to claim 2,
A magnetic sheet in which the plurality of radiations are disposed between the predetermined center point and the edge portion. According to claim 3,
The number of the plurality of second patterns is 3 to 8 magnetic sheets. The method of claim 4,
A magnetic sheet including a plurality of border lines on the border portion of the first pattern. The method of claim 5,
The disconnection section is a section in which any one of the plurality of border lines and one of the border lines and neighboring border lines are not connected to each other. The method of claim 5,
The first pattern,
A first region formed between a first radiation among the plurality of radiations and a second radiation adjacent to the first radiation;
A second region formed between the second radiation and the second radiation and a neighboring third radiation;
A third region formed between the third radiation and the fourth radiation and a neighboring fourth radiation;
A fourth region formed between the fourth radiation and the fifth radiation adjacent to the fourth radiation; And
And a fifth region formed between the fifth radiation and the fifth radiation and a neighboring sixth radiation.
The plurality of border lines,
A first border line surrounding at least a portion of the first region;
A second border line surrounding at least a portion of the second region;
A third border line surrounding at least a portion of the third area;
A fourth border line surrounding at least a portion of the fourth area; And
Including; a fifth border line surrounding at least a portion of the fifth region;
At least one of the first to fifth border lines is a magnetic sheet connected to another neighboring border line. The method of claim 7,
A magnetic sheet further comprising a plurality of radiation emitted from the center point of the first pattern between the fifth region and the first region. According to claim 1,
A magnetic sheet having a distance between two predetermined points facing each other of the edge portion in contact with an imaginary straight line passing through the center point of the first pattern is 50 μm to 600 μm. According to claim 1,
The soft magnetic layer has a thickness of 0.01mm to 0.04mm. According to claim 1,
A magnetic sheet including regions spaced from each other between the edge portion of the first pattern and the edge portion of the plurality of second patterns. According to claim 1,
A magnetic sheet including a portion of at least one cutout portion of at least one edge portion of the plurality of second patterns. According to claim 1,
At least one of the border portion of the first pattern and the border portion of the plurality of second patterns includes a magnetic sheet having a circular shape. According to claim 1,
A magnetic sheet including a curvature of at least one of the edge portion of the first pattern and the edge portions of the plurality of second patterns. Board; And
Includes; disposed on the substrate and a soft magnetic layer formed with a crack pattern,
The crack pattern,
A first pattern; And
Includes; a plurality of neighboring patterns disposed adjacent to the first pattern;
Each of the first pattern and the plurality of neighboring patterns,
A predetermined center point;
An edge portion spaced apart from the predetermined center point and surrounding at least a portion of the predetermined center point; And
It includes; a plurality of radiation emitted from the predetermined center point;
The plurality of neighbor patterns,
A second pattern and a third pattern arranged along a first direction with respect to the first pattern;
Arranged along a second direction intersecting the first direction with respect to the first pattern
A fourth pattern and a fifth pattern; And
It is formed between the first direction and the second direction around the first pattern,
It includes; a sixth pattern and a seventh pattern disposed along the third direction intersecting the first direction and the second direction; and
The distance between the center point of the first pattern and the center point of the second pattern and the distance between the center point of the first pattern and the center point of the fourth pattern,
Less than the distance between the center point of the first pattern and the center point of the sixth pattern,
The distance between the first pattern and the second pattern and the distance between the first pattern and the fourth pattern, respectively,
Less than a distance between two predetermined points facing each other of the edge portion of the first pattern in contact with an imaginary straight line passing through the center point of the first pattern,
A magnetic sheet including a cutout section of a part of the edge portion of the first pattern. The method of claim 15,
At least one of the rim portions of the first to seventh patterns includes a circular magnetic sheet. The method of claim 15,
The magnetic sheet having a distance between two predetermined points facing each other of the edge portion of the first pattern in contact with an imaginary straight line passing through the center point of the first pattern is 50 μm to 600 μm. The method of claim 15,
At least one of the plurality of radiations of the first pattern is a magnetic sheet that is not connected to the edge portion of the first pattern. The method of claim 15,
The number of the plurality of radiations of the first pattern is six or more magnetic sheets. Board;
A soft magnetic layer disposed on the substrate and forming a crack pattern; And
Includes; coil portion disposed on the soft magnetic layer,
The crack pattern of the soft magnetic layer,
A first pattern; And
Includes; a plurality of neighboring patterns disposed adjacent to the first pattern;
Each of the first pattern and the plurality of neighboring patterns,
A predetermined center point;
An edge portion spaced apart from the predetermined center point and surrounding at least a portion of the predetermined center point; And
It includes; a plurality of radiation emitted from the predetermined center point;
The plurality of neighbor patterns,
A second pattern and a third pattern arranged along a first direction with respect to the first pattern;
Arranged along a second direction intersecting the first direction with respect to the first pattern
A fourth pattern and a fifth pattern; And
It is formed between the first direction and the second direction around the first pattern,
It includes; a sixth pattern and a seventh pattern disposed along the third direction intersecting the first direction and the second direction; and
The distance between the center point of the first pattern and the center point of the second pattern and the distance between the center point of the first pattern and the center point of the fourth pattern,
Less than the distance between the center point of the first pattern and the center point of the sixth pattern,
The distance between the first pattern and the second pattern and the distance between the first pattern and the fourth pattern, respectively,
Less than a distance between two predetermined points facing each other of the edge portion of the first pattern in contact with an imaginary straight line passing through the center point of the first pattern,
A part of the border portion of the first pattern is a wireless power receiving apparatus including a disconnection section. delete

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